locking bolt spring

[einnar]

I am new in this list and it is my first time to handle a luger when my friend showed one and let me to keep it.According to him , he test shot the gun and it jam and when he tried to clear, the locking bolt and slide plate were move out.I searched in the web to see the diagram and how to field strip this gun.Ive noticed when it was locked open or when i moved the barel backward, locking bolt position went vertical and easily move out.Inside the hole where locking bolt inserted , i saw pin( seems a broken pin). I saw one diagram describe it as locking bolt spring but no clear picture or drwing how it looks like, I need help on where i could find picture of this or someone from this list could provide me a picture on how this pin/spring placed inside the hole, another thing is what is the use of small hole under front of the frame protruding to the hole for locking bolt.

Rannie